Piano City is a Social Music Game for iOS developed and published by UK-based game development company Room 8 Studio. The game was released on September 24, 2014. Piano City is a music game that take
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5c69fdb336967e4bbdc4fe5034074835aa337e75232bf4e814cfb056fc8c44. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/16ee399d-fefa-4bd1-9119-1bc5995a2cc2.json and https://artists.proofprofile.net/proofs/artist/16ee399d-fefa-4bd1-9119-1bc5995a2cc2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824e3fe7bfcdfac67385a752212f05a7b0cf5068b61f854080c54ffbfdea0be7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e3b69752a33ac28796be781de64d34af21bf6abe7b25ba3bbb73392b492c3b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a8db5c6833e2de029799aa6c6d792196afff0c34602d18dbff60a4bab26b79. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9219763cf3ae3d973988b2ff1772fa1987af53f793ea9eefca068540a18d95b7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b4d7ad1eb0c6e742e435ed68f96d66a1c72d4766712ea3a602feca61dfd7b0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29dc9e07d534bfa7fbd44259a657fcd6db515e67d09f3e69b62f89b3be58cf74. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748228aa15df6e7a42ac58fd0e67762d88415a7efa64fdd692712ba8dc15bddb. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000060.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c9c743e30dcb9778ed6748af29f6e8f33e5bebd4d2eeb0a29da27e41e986e2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6222a4c377dba7dafe2bd497d0629de15d83b8c2a7102331cd2012d2e53a0c6. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a740626d9f11e0d7566eb042173cc773e11e6c3ccaa54b1cf7d1d31be21e9a7. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1bb0a0cab296e2cb593ee789a4895da3a8ae9eb1624ae678eb2e1062f3ddfa. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18612d36d0f9653b6427ca9b38b72e74a8d79c05b73ba4951cfb1c5980ec08be. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d630d88a3f5a960186651e1a6b5292132c7ae5e2223277f491522051a0cb594. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a61b95663575d81e4df9bd8c7687150ea42443995f9917e06961306613d397. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f2fb7f13e3ca39895f76eead1438b91ff29ae9baa07f6afd2d27414ef6926e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c7f2a75882971bf4fc6762ce65216b49fe5115394e3164ff1efcf1b6c30ea1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836236b6400270c18fa8215a094cad51ca21aa02ae7e904060d6b5c6f56df8d9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd7dccf7d2db9c52e0c6e25d2144fd8bf0dded476feef92ed7e4f88f577b848. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca754aeb9351563732f32d02459dbd0430f09c110eced7142a1801c3f87bf31. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c07296b5f67f2e3c134d34104510ca6146fb7b2df4e9ef5a1d0958d7dcf4693. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA6EE2000076.